Satisfies assertion in PawnTest::testDownLeft

+ Pawn should not be able to move down and right
Adds assertions to PawnTest::testDownRight

+ Pawn should not be able to capture own color
+ Pawn should be able to capture down and right
Satisfies PawnTest::testDownRight

+ Pawn should be able to capture down and right
Adds assertion to PawnTest::testDownRight

+ Pawn should not be able to move off edge of board
Satisfies PawnTest::testDownRight

+ Pawn should not be able to move off edge of board
Adds assertion to PawnTest::testDownRight

+ Light pawn should not be able to move down and right
Satisfies PawnTest::testDownRight

+ Light pawn should not be able to move down and right